This section describes the most common forms of long-wavelength magnetic modulations reported in the literature, and includes a description of helical, conical and skyrmion lattice orders. A class of materials which has been shown to support all the abovementioned forms of non-collinear magnetic order are the family of chiral magnets (e.g. MnSi, FeGe, Fe\(_{1-x}\) Co\(_x\) Si and Cu\(_2\) OSeO\(_3\) ) which crystallise in the B20 cubic structure with \(P\) 2\(_1\) 3 space group symmetry [1]}. In the following sections, the cubic chiral magnet of MnSi is chosen as the working example as it has a well-documented phase diagram [2]}, a cubic lattice and exhibits non-collinear magnetic periodicities on the length scale applicable to small-angle scattering [3]}.
